Improvement in fvlechanical movements



A. E. BLAKE. MECHANICAL MOVEMENTS.

Patented'Sept.12;1876.

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ARTHUR E. BLAKE, OFLMEINDOTA, ILLINOIS.

IMPROVEMENT IN MECHANICAL MOVEMENTS.

Specification forming part of Letters Patent No. 182,!53, datedSeptember 12, 1876; application filed August 16, 1876. I

To all whom it may concern Be it known that I, ARTHUR E. BLAKE, of

- Mendota, in the county of La Salle and State of Illinois, haveinvented a new and useful Improvement in Mechanical Movements and I dohereby declare that the following is a full, clear, and exactdescription of the same, reference being bad to the accompanyingdrawing, which forms part of this specification.

This invention is an improvement upon that description of mechanicalmovements in which a revolving driving pulley or device is made tocommunicate to a concentrically-arranged shaft rotary motion in onedirection only by means or through the intervention of a pawl andratchet-wheel.

The invention is applicable, among other purposes or uses, to thedriving of sewingmachines, to prevent back movement of the sewingmechanism when the driving band pulleys or wheels are rotatedbackwardly.

The invention consists in a novel combination of parts, whereby theratchet-wheel, which is fast on the shaft to which it is required tocommunicate motion in one direction only, is operated byapplying theentire driving force directly to the end of the pawl, in such a manneras to cause a rocking motion of the pawl on its pivot sufficiently forto positively throw and hold the pawl in and out of the ratchet, and tokeep it away from the ratchet during the back motion, and in look orgear therewith during the forward motion, without the aid of a spring.

Figure 1 represents a partly-broken face view of my improved mechanicalmovement applied to a concentric shaft designed to travel in onedirection only, and operated by a band-pulley which is free to move inreverse directions. Fig. 2 is a transverse section of the same, taken indirection of the length of the shaft.

A is the band wheel or pulley,.to which may be attached a fly-wheel, B,and which is free to turn in reverse directions on or around aconcentrically-arranged shaft, 0, preferably at or near one end of thelatter. D is a ratchetwheel fast on the shaft 0,- and having an attached disk, b, on its back, of a slightly-greater diameter than saidwheel. This disk b fits, in common with the ratchet, snugly over theshaft 0, and the two are secured to said shaft by key or otherwise. E isa box, fitted to turn loosely on the shaft 0 in rear of the disk I), andof sufficient depth or capacity to receive freely within it theratchet-wheel D and its attached disk I), which latter serves as abearing for the box. Said box should beof a sufficiently large interiordiameter where it incloses the ratchet to allow for wear of the bearing.

A recess, 0, is formed in one portion of the rim or side of the box E,to receive the pawl G, and to provide room for the rocking or working ofthe latter therein. This I pawl works on a pivot, cl arranged within therecessed portion of the box, and is'a lever of the first order, itsinner end or arm serving to engage and disengage with the ratchetwheelD, and its outer end or arm made to extend through and outside of therecess 0 in the box, and forming the portion to which the driving forceis applied. Said pawl may be balanced on its pivot, so that theslightest application of force will serve to throw it in or out of theratchet-wheel.

H is a cover or plate, which may or may not be used on the outer end ofthe box or pawl-carrier E, but which, if used, serves to assist inholding the pawl in place to exclude dust from the ratchet, and toconceal and protect the working parts.

Projecting outwardly from-the face of the band wheel or pulley A,against or in close relation with the hub of which the box E isarranged, are pins 8 s, on opposite sides of the outer end or arm of thepawl G, with sufficient play or lost space between said pins for thepawl G to engage and disengageitself with the ratchet-wheel D.

In the operation of the device, when the band wheel or pulley A ismoving in a forward direction, as indicated by the arrow w, the pin orprojection s strikes and acts on the outer end of the pawl G, to projectand hold it within the ratchet-wheel D, and to rotate in the samedirection the shaft 0, to which the ratchet is attached. When, however,the band wheel or pulley A is moving in a backward direction, asindicated by the arrow y, then the pin or projection s strikes and actson the end of the pawl G to lift and hold it out of sides of one end ofthe pawl, and having lost contact with the ratchet-wheel D, and so leavespace or motion between them, the ratchetthe shaft 0 at rest while theband wheel or wheel D, and the shaft 0, substantially as pulliley andpawl turn around it. specified.

claim The combination, with the pawl G, pivoted ARTHUR BLAKE to thelooselyrevolving box or carrier E, of Witnesses: the driving pulley ordevice A, provided with JAMES F. BLAKE, pins or projections s 8,arranged on opposite HERMAN M. WEBSTER.

